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Reasoning is especially potent on your first turn of a match, since your opponent will probably expect that you are playing Infernoid, the only other competitive option that runs Reasoning at the current time

This card originally from Future Sight also has the distinction of being the only transmutable land in the game

Milling 2-3 useful Shaddolls/Peropero and a fusion/other useful backrow will probably win you the game there and then because of the sheer amount of advantage you gain, but if you mill a bunch of backrow or mill useless Shaddolls (ones that have already been used or Dragon when they have no backrow) it's very mediocre and eats up a normal summon which, while not essential, is often better taken by Math in that case

The last ability of Kroxa and Kunoros triggers and goes on the stack without a target